Features:

Product Name: S10 Bluetooth speaker radio support U disk TF card
Bluetooth version: V4.0
USB charging input voltage: 5V
Battery capacity: 400mAh
Endurance capacity: about 6-12 hours
Stereo Speaker Rated Power: 3W
Charging voltage: 5VDC
Lithium battery specifications: 3.7V
TF card: support (not included)
Signal to noise ratio: 90HZ-20K / 65dB
Bluetooth use band: 2.4000GHZ - 2.4835GHZ
Wireless transmission distance: about 10 meters/32.81ft
Product Size: about 60 * 50mm/2.36 * 1.97in
Packing list:
1 * S10 Bluetooth speakers radio support U disk TF card
1 * Charging data cable